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From: "guojiufu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/101145] niter analysis fails for until-wrap
 condition
Date: Fri, 25 Jun 2021 01:28:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101145

--- Comment #3 from Jiu Fu Guo <guojiufu at gcc dot gnu.org> ---
Yes, while the code in adjust_cond_for_loop_until_wrap seems somehow tricky:

  /* Only support simple cases for the moment.  */
  if (TREE_CODE (iv0->base) !=3D INTEGER_CST
      || TREE_CODE (iv1->base) !=3D INTEGER_CST)
    return false;

This code requires both sides are constant.=